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- Allen Bradley
- 1785-L80E
- PLC-5/80E Processor
- USA
- 165 x 51 x 89 mm
- 1.39 kg
- Xiamen, China
- New & In Stock
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Product Overview
The Allen-Bradley 1785-L80E is a high-performance PLC-5/80E processor module from Rockwell Automation’s PLC-5 series. It is the central CPU of a PLC-5 system and is designed for large-scale industrial automation applications requiring strong communication capabilities, high I/O capacity, and reliable real-time control.
The “E” version indicates Ethernet-enabled communication, making it one of the more advanced PLC-5 processors for legacy networking environments.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Model | 1785-L80E |
| Product Type | PLC Processor Module |
| System Series | PLC-5 |
| Processor Type | PLC-5/80E |
| User Memory | up to 100K words (battery-backed SRAM) |
| I/O Capacity | up to 3072 I/O points (system dependent) |
| Communication Ports | Ethernet, DH+, Remote I/O, Serial (RS-232/422/423) |
| Programming | RSLogix 5 (ladder logic) |
| Installation | 1771 I/O chassis |
| Backplane Power | 5 V DC (via chassis) |
| Max I/O Chassis | up to 65 (system dependent) |
| Dimensions | 165 × 51 × 89 mm |
| Weight | 1.39 kg |
Function and Working Principle
The 1785-L80E operates as the main control processor in a PLC-5 system.
Its core operation cycle includes:
- Reading input data from I/O modules
- Executing user-defined ladder logic programs
- Processing communication tasks (Ethernet, DH+, remote I/O)
- Updating outputs to field devices
- Repeating the scan cycle continuously for real-time control
It supports deterministic industrial control, ensuring predictable timing for process automation.
Key Features
- High-performance PLC-5/80 class processor
- Integrated Ethernet communication capability
- Supports large I/O configurations
- Multiple industrial communication protocols (DH+, RIO, serial)
- Battery-backed memory for program retention
- Designed for complex distributed control systems
Industrial Applications
- Large manufacturing automation systems
- Chemical and petrochemical plants
- Power generation facilities
- Water and wastewater treatment systems
- Heavy industrial process control
- Distributed legacy PLC networks
Role in Industrial Systems
The module serves as the central controller of PLC-5 architectures, responsible for:
- Executing control logic in real time
- Managing multiple remote I/O racks
- Handling industrial network communication
- Coordinating plant-wide automation tasks
It is commonly found in older but still operational industrial installations.
Installation Notes
- Installed in a 1771 PLC-5 chassis
- Requires compatible power supply module
- Proper termination required for DH+/RIO networks
- Battery backup required for memory retention
- Configuration done via RSLogix 5 software
Compatible Equipment
- 1771 I/O chassis systems
- PLC-5 I/O modules
- DH+ and Remote I/O networks
- Allen-Bradley legacy communication modules
- RSLogix 5 programming environment
Advantages
- Very high reliability in industrial environments
- Strong communication flexibility for legacy systems
- Supports large distributed I/O architectures
- Long operational lifespan
- Proven industrial performance
Limitations
- Obsolete / legacy platform
- Not compatible with modern ControlLogix systems
- Requires specialized maintenance knowledge
- Limited modern cybersecurity and networking features
Conclusion
The Allen-Bradley 1785-L80E PLC-5/80E Processor is a powerful legacy PLC CPU designed for large-scale industrial automation with Ethernet-enabled communication.
It remains widely used in existing installations where PLC-5 infrastructure is still in operation, providing reliable and deterministic control in industrial environments.